Abstract
Comparisons of the infra-red spectra of uranyl dibutyl phosphate polymer [UO 2(DBP) 2] n, tri- n-octyl phosphine oxide (TOPO), and dibutyl phosphoric acid (HDBP), for both the separate reagents and in combination in carbon tetrachloride, are consistent with the formation of UO 2(DBP) 2· 2TOPO, UO 2(DBP) 2HDBP·TOPO and UO 2(DBP) 2·2HDBP. The data imply that extraction of UO 2 +2 from aqueous solutions by combinations of tri- n-octyl phosphine oxide and dibutyl phosphoric acid dimer may be represented by the equations UO 2 2+ + 2( HDBP) 2 + TOPO ⇌ UO 2( DBP) 2· HDBP· TOPO + 1 2 ( HDBP) 2 + 2 H + UO 2 2 + ( HDBP) 2 + 2 TOPO ⇌ UO 2( DBP) 22 TOPO + 2 H + . Considerable hydrogen bonding between TOPO and HDBP occurs when these reagents are together in solution. The evidence for previously-postulated structural formulae for the uranium species is not conclusive, but the data are consistent with the equivalence of three DBP ligands in uranium species containing HDBP.
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